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Muscular System (Body Movement (Circumduction-end of limb and distal end…
Muscular System
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Sliding Filament Theory
- Myosin moves toward M line and pulling actin filaments past myosin
- The action is repeated many times at ATP
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- Ca++ binds to actin myofilament, exposing the myosin binding site
- Z line gets closer together to actin and filaments slide past each other
- nerve impulse potential travels down sarcolemma and into t-tubes causing it release Ca++ into sarcoplasm
Muscle Contraction
- This causes receptor to change shape and opens Na+ channels in sarcolemma
- Electrical current is generated and is carried along sarcolemma, cause action potential
- Ach diffuses across synaptic cleft and bonds receptors on motor end plate of the muscle cell
- Nerve impulse reaches synaptic end bulbs and causes vessels to fuse and make Ach
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Posterior muscles
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Hip/Thigh/Leg
Hamstring- semitendnosus, semimembranosus, beicep femoris
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